Christina wrote this expression to describe the amount of money she has. 10 × y which situation could be described by this expression? a. christina only has dimes, but she does not know how many dimes she has. b. christina only has quarters, but she does not know how many quarters she has. c. christina only has nickels, but she does not know how many nickels she has. d. christina only has pennies, but she does not know how many pennies she has. question resources

The answer is a) Christina only has dimes, but she does not know how many dimes she has. The reason why is because 1 dime is equivalent to 10¢, so if she were to count the money she has she would have 10¢ x y

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."